/Engine/Source/Runtime/Slate/Public/Framework/Application/SlateApplication.h
true if the difference between the ScreenSpaceOrigin and the ScreenSpacePosition is larger than the trigger distance for dragging in Slate.
bool HasTraveledFarEnoughToTriggerDrag ( const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) & PointerEvent, const [UE::Slate::FDeprecateVector2DParameter](API\Runtime\SlateCore\Types\FDeprecateVector2DParameter) ScreenSpaceOrigin, EOrientation Orientation ) const